Pokémon Let's Go Pikachu and Let's Go Eevee feature a change to the Pokémon wild encounters. First, they're not entirely random anymore with the ability to interact with Pokémon on the field. However, when you do interact with Wild Pokémon, you no longer battle to weaken them. Instead, you go to a capture screen.
This screen is like the capture in Pokémon GO where you have the Pokémon and just throw the ball at it. This is done with the Joy-Cons motion detection. The better the throw into the circle around the Pokémon, the better the chance of capture